They each have their own inventory and a specific list of items that only those blocks can manufacture. They require to be powered in order to manufacture anything at all. The SD HCT xm3.4 Power block can be used for these factories. Once your factory has been powered, simply put the ingredients in the right factory block, and it will start producing whatever it is programmed to produce with an interval of roughly 5 seconds.

Note: Some ingredients may be used in multiple recipes and therefore the factory may produce byproducts.

If you were to put large amounts of Rock and Plextanium L1 in the Particle Press, then it would start producing both of these, taking turns in what to produce.

However, as 500 Rock is needed for a science bottle, you can easily avoid manufacturing these by reducing the amount of Rock you put into the Particle Press. Now 475 Rock could be considered too little to let the factory block consume at once. This is where Factory Inputs come in handy.

Machines won't use half a stack of material from one place, and half a stack from somewhere else. So you could split a large quantity of rock between multiple FactoryInput blocks, so that you get Grey Hull instead of Science Bottles. FactoryInputs do not manufacture anything by themselves.

This block can be used to increase the production rate of a factory block. Press C on a factory block such as the Particle Press, and then press V on a FactoryInputEnhancer. The factory block should now produce twice as much as before. Please note that it also consumes twice as much. The production rate has improved, not the ratio.

Linking factory blocks:

One-way link: Pressing C on a Schemadyne Advanced and then pressing V on a Particle Press. The Schemadyne Advanced is now capable of taking items from the Particle Press in order to complete a set of ingredients for a recipe that is only available in the Schemadyne Advanced.

Two-way (binary) link: After pressing C on the Schemadyne Advanced and pressing V on the Particle Press, you now also press C on the Particle Press and V on the Schemadyne Advanced. Now both factory blocks share their inventories and can take whatever they need from each other to complete their own recipes.